Locking device for typewriters



A 15684302 R. HEIMERS LOCKING DEVICE FOR TYPEWRITERS Sept. 18, 1928.

.Filed April 2s, 192e zshets-sneet 1 y' y I.

Sqn. 1s, 192s.

- R. HEIMERS LOCKING DEVICE FOR TYPEWRITERS 2 Sheets-Sheet 2 Filed April23, 1926 Patented sept. is, i928.

RUDOLFHEIMERS, OF .TACUBAYA, MEXICO.

" 'y Y LOCKING Diivion Fore. iYienwRiTiiR-s.

Application filed April cally locking the movement ofthe carriage of thetypewriter as soon as this number of lines has 'been reached. A f

It is an'objeet of the present invention to provide a -deviee whicheffectively. prevents the operator of the typewriter from writing` morethan. a. predetermined number ot lines on one sheet of paper, in orderthat a uni-form marginV on the lower edgek ot 'all the sheets maybeobtained. l

It is another object et this-invention to provide a device whichannounces tothe operator from the accompanyingdrawings taken inautomatically and b v the sense of touch when a certain numbert'typewritten vlines have been finished. thereby eliminating thenecessity of having` to watch the advance 0i the sheet, and thiscertainty ot beingsr palpably informed when the last line has beenreached, permits a lgreater concentration on vthe work and results in anincrease inthe speed and aeeuraey of the writing. The'device which formsthe object of the present invention, substantially consists in a countwheel, connected with and operated by the line spacing mechanism of thetypewriter, and in an adjustable stop onsaidcount wheel, whichcooperates with arelease lever on the carriage rack. in such a. way thatafter ya certain number nof lin'e'shave been written, accordingjto theadjustmentV of the stop on the count wheel, the release lever isdisplaced by said stop andv by its movement interrupts the compulsoryconnection in the carriage rack, so that the carriage is pulled to thelett by its spring and locked in-this position.` Through this release ofthe carriage, united `generally with a further automatic lockingof the'key board, the Operator is palpablyinformed that the prescribed numberoi' lines has been written.

The invention will be readilyl understood connection with the followinodescription and kthe terms oit the appended claims.

f In. the n drawings:

l Fig. l is a side elevation of part ot a typewriter provided with theindicating and lockingrdevice. A

Fig. 2 is a plan view thereof.: f Y.

Fig. 3 is a sectional view of the count wheel.

Fig. 4t is a detailed view of the carriage release mechanism.y .Y f

as, ieee,- seriall no.

lee ein', and in switzeriaaa April 24, 1925.7

Fig. 5 is a detailed View of the adjusting mechanism of the count wheel;Having reference to the drawingathere is shown part of a typewriter otthe Underwood system, the left side ot which carries a supporting memberA, on which a slide B may be moved backward and forward within'certainlimits. said slide Bis detained by a ball resting in an .opening 1 andpressed down by a iiat spring b2 (Figures 2 and 3) ,and which entersinto either one ot' the recesses or holes a ofthe supporting member A. v

The slide B carries a count wheel D contained within a round casing D:land provided on its front side with a number ot' teeth which extendbeyond its periphery. In one ofthe terminal positions of the slide B,the perinr phei'ical portions ot these teeth engagea drive.

wheel C, placed on the axle of the roller ofthe carriage andpreVent-edfrom' turning on said aXle by the pins c1, and which drivewheel is moved Ystep by step by the line spacing` mechanism of themachine, together with the roller. In the opposite terminal position ofslide B,

In its two terminal positions this wheel is disengaged from the countwheel D. v y

On t-he front side of countwheel D and over its rontteeth there is madeto glide an adjustable stop F which maybe detained-in any position alongthe divisions marked on said count wheelgfthese divisions correspondwith the nuinberof lines which, can bewritten on one sheet of paper. InFigure l, for instance, the stop Fis placed with its eitective edge fondivision 60 of the dial, which means that after 60 lines have vbeenwritten on the sheet, this fact will be made know-n to the operator bypalpableV means as will be more fully explained hereinafter. f

The adjustment of the stop F along the dial of the count wheel D isei'lected by means Vof a` knob F1 connected therewith, which knobtogether with the stop F, revolves on a Xed axle m, on which is alsoloosely placed the count wheel D. 'The positive engagement between thestopF and the count wheel D is secured by a number ot inner teeth 7"0provided on saidI stop, and a spiral spring m1 which pushes said teethagainst andbetween the opposite 'iront 'teeth of the count wheel.

The stop F has `lor its obJect to .cooperate with a release lever II bymeans ot an inter-Y mediate stop G. rIhis intermediate stop is pivoteding on a casing G1 made to revolve Yon slide B,l and is provided with afinger g1 l spring and connected by means of a pin 3 with the carriagefeed rack, which as known engagesa pinion which together with thecarriage springend feed mechanism lets the carriage escape stepV by stepto thel left. The

' carriage rack and feed mechanism located Y of the carriage tothe leftand by the combined simultaneous locking of the key board.A By this theoperator knows that he has writ' beneath are not shown in the drawings,as they are well known. It sutlices to remark that this Arack maygenerally be raised for disengaging it from its pinion. l

AThe device as describedabove Works as follows: i

{.Witheach spacing of a line, the count wheel D is revolved bymeans' ofthe drive Wheel C in the direction of thev armfw l) for one,twoor threeteeth,`acco`rd ing to the line space adjuster. When `the sheet iscovered with the desired number of linesjn the present case with 6()lines as determined by the position of the stop F, on

.operating the usual feed lever for advancing another line the stop `Fwith its edge f comes intozcontact with the `iintermediate stop G andpushes it back, so that the release lever H isfrotatedto the left withits tooth n by the intermediate stop G (Fig. 1) by which means the lever"H is released With its nose i' and rises through the action of itsspring i', disengaging the vertically movable carriage rack lfrom itsfeed mechanism Withwhich it is usually engaged. By this means thecarriage which hadbeen pushed to the right for starting theV new line,is pulled back to the left by'its spring, and this is broughtimmediately to theattention ofthe operator not only by the sense oftouch While he retires slowly to the leftV the handwhich had moved thecarriage, but also by the very evident rush ten'the prescribed number oflines en the sheet.

When it is desired to start a new sheet, the

Vusual finger levergO, pivoted on the leftside of the machine, is pushedup. As this lever is connected withl the pin 2', this latter is pusheddown so as to engage again the carriage rack With its pinion`,and sothat the lever I and the tooth n of the spring operated release lever Hcan grip the nose i of the lever I for detaining `it in the position ofengagement between rack and pinion. It may be preferable to keep theleft hand free, and in this case the right hand finger lever of themachinemay be operated similarly, asboth levers are connected together.It may be remarked that both of these levers permit as before the manualseparation of the` rack and the pinion; At the same time, the slide ispushed back by hand into its rear termlnal gisition., sofas to disengagethe count Wheel from the drive Wheel C, and to let the count wvheel D,with its stop F, return by means of a spiral spring 1' intoits primaryposiftion. The device is new ready for writing i l milling functionster'the writing of the First the intermediate stop G 60 lines, outwardby its finger gL around its ulcmm pin g', so that theplate-shaped stopF, may slide under the intermediate sto `Gr linxtil it reaches a pointWhere an eleva strip d pro vided on stop F touches the intermediate stopG, and instead of the former stopping edge f, produces the Yreleaseofthe lcverpH with the vresult that theconnection between they mok andthe pinion in the carriage is again broken. The position of the strip scorresponds with the number oaddticmnl lines to be To Vobte-in this,'and i ssY and may be adjusted by means of a pin enters into holes onthe face of the stop F. r `The initial position ofthe count wheel D 'mdetermined by a catch screw w provided on it, `which `places itselfagainst a stop screw t of a levefT (Figu'). This lever may be adjustedon the casing DL by meansrof n slot v provided through which slot. p thescrew t. 'Ilm ndjustmem will only have to be made wkn the whole `numberof lines rnitted by tlm count. wheel is to be utilimdlnwith the stop Fplaced vertically downward, as in this case and while the count wheelrotates in the di rection ofthe arrow az, the screw w of the count wheelwill finally touch the lever T,

`whichever yielding permits the count wheel to make a completerevohltion.

The termination of the prescribed number of limes, with cfr-withoutadditional lines,

at the same time visible by the ive postion ofthe intermediate stop G onthe dial of the count Wheel. If the stop F should inadvertently be movedbeyond Athe second warning position, it carries with it the inter-Vmcdiatelstop G, pushing back` the level-"H, and brings 1t toa pointWhore it touches a lock screw y mounted adjustablyon the cas-.I ing D1.This ward movementof the slideB so as to disengage the count Wheel Dfrom the drive wheel C. `Even without .this screw there Vwould be acertain obzruction in the drive wheel C which would indicate that thestop F hadbeen turned too far. .Obviously the count fn said casing(Figmresl and 5), y,

produces necessarily a backi i Vand described as applied to an Underwoodmachine, it may obviously be used with any other make of typewriter7making the alterations and changes therein which may be required toadapt it to the different construction anddisposition of the parts whichit is to operate.

What I claim is:

1. A locking device for typewriters, comprising a graduated counterconnected with and revolved by the line spacing mechanism, means fordisengaging said counter from'the line spacing mechanism, a concentricadjustable stop on said'counter for determining the number of lines tobe written, means for dis- `engaging' through said stop the carriagerack from its pinion, and means for returning said counter to itsprimary position with each new sheet.

2. A locking device of the class described,

comprising a graduated counter in form of a wheel with front andperipherical teeth, a casing enclosing saidcount wheel mounted on asliding member provided at one sideof the typewriter, means fordetaining said sliding member in two different positions, a gear wheelmounted on the axle of the roller for engaging the count wheel in oneposition of the sliding member, a movable stop for adjusting on saidcount wheel the number of lines to be written, and means for disengagingthrough said stop the carriage rack from its pinion.

3. A locking device of the class described, comprising a graduated wheelwith front and peripherical teeth, means for transferring to said wheelthe rotations of the roller effected by the line spacing mechanism, aHat stop concentrically mounted with the count wheel for adjusting thenumber of lines to be written, an intermediate stop operated by contactwith the adjustable count wheel stop, and a release lever 'operated bysaid intermediate stop for throwing the carriage rack out of gear withits pinion.

In testimony whereof I aiiiX my signature RUDOLF HEIMERS.

